Grinding-machine for file-blanks



2 Sheets-Sheet. l.

avoGBL. Grinding-Machine vfor File-Blanks.

Patented June 8; 1880. l

(f7/uml@ e @6fw W. .25M

ruriis. PMOTO-UTHOGRAPMER.-wAsmNGTON, Dv c.

2 sham-'sheet 2.

G. VOGEL.,

Grinding-Machine for PiIeB1a.nks.

x Patented .lune 8,1880.

' mumunumli ilNiT-ED STAT-Es PATENT OEEicE.

CHARLES VOGEL, OF FORT LEE, NEW JERSEY.

GRlNDlNG-IVIACHINE FOR FILE-BLANKS.

SPECIFICATION forming part of Letters Patent No. 228,574, dated June 8, 1880.

Application filed January 7, 1880.

the closest together at the point, and in other instances the surfaces are slightly convex.

Attempts to grind lile-blanks by machinery are attended with difiiculty, in consequence of the tapering form.

My machine is made for grinding articles such as Ele-blanks with great uniformity and rapidity, regardless ofthe amount of the taper that is given to the blank in the forging operation.

I make use of a revolving slab of emery, or similar material, secured to a metal disk, and the file-blank is moved in the direction of the radius of the slab, and the tile-blank is supported by a fence and moved by the action of rollers. These rollers and a stationary bed on which the le-blank islaid serve to present the le correctly to the action of the revolving grinding-slab, and the feed-rollers accommodate themselves to the taper of the file-blank, and cause the grinding to progress regularly by applying the proper relative pressure to the portion of the blank that rests upon the table and to the portion against which the grindingslab acts.

In the drawings, Figure 1 is a plan view of the machine below the line y y. Fig. 2 is a side view. Fig. 3 is a front elevation of the lower end of the shaft of the revolving slab and its supporting-rest. Fig. 4 is a section at the line xx, showing the links for the feedrollers, and Fig. 5 is an elevation of the machine with the bed in section.

a is a base, and a a standard, and bis a bed supported upon the standard, and formed with or connected to the ring b.

Upon the face of the standard a is a frame, c, having journal-boxesZ and 3 for the shaft d, which carries at its upper end the metal disk f and grinding-slab e, attached thereto.

The frame c is connected by V-slides to the standard a', so that it is held in position', but it can be raised or lowered vertically to bring the grinding-surface at the proper level with the bed b and ring b', the screw 4, passing.

through the arm 5 of the frame c, serving to adjust and sustain the frame and grindingslab in the proper position.

A belt to a pulley, d', upon the shaft d serves to revolve the shaft d and grinding-slab e at the proper speed.

The grinding-slab is, by preference, formed of a flat ring of emery upon the surface of the disk j', so that the same may be easily replaced when worn ont.

Upon the bed b and ring b there is a fence or support, h, against the edge of which the file-blank lies as placed upon the bed b. This fence. is in such a position that the file-blank Will be radial to the disk, or nearly so, and such file-blank is to be moved endwise as it is ground, commencing at or near the point.

The rollers l m are preferably made with an elastic covering, such as india-rubber upon metallic rollers, and such rollers revolve upon shafts or gudgeons 7 and 8, that are received in and supported by the pairs of links o o and r fr', the ends of which links swing upon the shaft 9. The motive power that moves the rollers Z. m is .applied to the pulley p, and a pinion on the shaft of said pulley rotates the wheel s and its shaft 12, and also the wheel t and its shaft 9, and at the other end of the shaft 9 there is a small gear-wheel, 15, that gears into the piuions 17 and 18, that are formed with or connected to the rollers Z m.

The links o o and r r', that sustain the shafts 7 and 8, allow the rollers l m to rise or fall, and at the same time the 4wheels are kept in gear, because the power is derived from the same shaft that forms the pivot for the links to swing upon, and there are stop-screws 19, (see Fig. 4,) that limit the downward movement of the links, and prevent the rollers Z m coming into contact with the bed b or grindin g-slab e.

The lever@ is pivoted upon the frame o', and has links 20, 21, and 22. The lower ends of the latter are pivoted to the links o o', so

'that by depressing the handle of the lever the IOO rollers Z m can be lifted for the insertion of a {ile-blank beneath them, and the Weight 24 will, when the machine is in use, act through the links and press the rollers upon the leblank with the proper force to keep the same down upon the bed and the grinding-slab, respectively, and, in order to regulate the relative pressure, the pivots th at connect the links 0 and 22 and o and 21 are movable in slots in o 0, so that the pressure acts with lnore or less leverage, according to the distance that the pivot is from the roller.

The frame o can be swung upon the shaft 12 as the center, so as to move the rollers toward or from the centeroil the revolving slab, and thus adjust them relatively to the. place where the grinding is heilig performed and the bed on which the file-blank rests.

The arch-piece 26, which is slotted, serves to sustain the frame c in its position by a bolt passing through the slot.

At the end of the shaft 12 there is a Wheel, 30, and the shaft 12 also forms a fulcrum for the lever 31, and 32 is a gear-wheel, and 33 a roller (shown by dotted lines in Fig. 2) at the short end of the lever, that is revolved by the gearing and passes up into a mortise in the bed b, so as to'press against the under side of the file-blank as it lies upon the bed.

The Weight 34 is movable on the lever 31, and it is not intended that the leverage shall be suficient to canse the roller 33 to lift the file-blank from the bed, but only that it shall lessen the friction of the same upon the bed and prevent the blank stopping as it is moved along endwise over the grinding ring e by the rollers l, m, and 33.

As the grinding progresses the blank running against the fence 7L is guided by the bed, and the two upper rollers, lm, press the blank toward the bed, and if the blank is flat the grinding will make the surface level, but the rollers are free to riseas the thicker portion of the [ile-blank passes beneath them. If the file-blank is slightly convex the grinding Will be true, but the convexity Will remain.

If the lower roller, 33, has a covering of india-rubber it may be used to feed the file-blank along if a suitable spring is used to hold the file-blank down to the bed.

In my machine the rollers will tend to keep the body of the le-blank dat upon the bed. Hence if there is anyinequality or twist in the end ofthe {ile-blank, Where it has been forged down thinner, the grinding will remove such inequality.

I claim as my invention- 1. The combination, in a 1e-grinding ma chine, of the rollers lm, gears 15 17 18, links 0 o'r o", shafts 7, 8, and 9, lever c, links 2() 21 22, connected adjustably tothe links 0 o', and the stop-screws 19, substantially as and for the purposes set forth. l

2. The combination, in a file-grinding machine, of a flat revolving grinding-ring adjust able vertically, a bed, b, ring b around the grinding-ring, and a fence, h, attached to the bed and ring b', respectively, and against which the vfile is moved in grinding, substantially as set forth.

3. The combination, in a ille-grinding ma chine, of the rollers Z m and the gearing for the same, the adjustable frame cf, for allowing the rollers to be moved toward or from the grinding-slab, the levers and links for applying pressure to the rollers,and the stop-screws 19, substantially as set forth.

. 4. The combination, with the bed b, of a Weighted lever, 31, a roller, 33, upon the short arm of the lever acting Within a mortise in the bed to move the {ile-blank or other article resting upon the bed, and gearing connecting the roller to the actuating-shaft 12, which shaft also forms the fulcrum for the lever, substantially as set forth.

Signed by me this 2d day of January, A. D. 1880.

' CHARLES VOGEL.

Witnesses WILLIAM; G. Mor'r,

lnAs. H. SMITH. 

